If you aren't familiar with Patreon, you should be. It's a membership platform that caters to artists and content creators, allowing them to be paid by fans and patrons. Patreon recently announced they are adding support for WordPress. Their plugin allows basic Patreon functions outside the Patreon website. This is likely based on demand from users, which I love to see.
It also seems to allow patron-only posts on sites where it's installed, rather than requiring backers to post their feedback on Patreon itself.